Merge pull request #3581 from Wovchena/CONTRIBUTING.md-deprecate-omz

CONTRIBUTING.md: deprecate omz

Author: Wovchena

CONTRIBUTING.md

@@ -1,5 +1,7 @@
 # How to Contribute Models to Open Model Zoo
 
+> Open Model Zoo is deprecated as a source of public models. Consider adding new models to https://github.com/openvinotoolkit/openvino_notebooks
+
 We appreciate your intention to contribute model to the OpenVINO™ Open Model Zoo (OMZ). OMZ is licensed under the Apache\* License, Version 2.0. By contributing to the project, you agree to the license and copyright terms therein and release your contribution under these terms. Note that we accept models under permissive licenses, such as **MIT**, **Apache 2.0**, and **BSD-3-Clause**. Otherwise, it might take longer time to get your model approved.
 
 Frameworks supported by the Open Model Zoo: